Damping system for shift cable

ABSTRACT

A damping system for a shift cable is disclosed, in which vibrations and noises that are generated by a transmission and transmitted into the interior of a vehicle through a shift cable are considerably reduced across a damper, that is positioned in a bottleneck section of a socket housing and contacts with bottleneck section, such that it is possible to effectively exclude vibrations and noises transmitted into the interior of a vehicle. Further, the present invention is advantageous in terms of the cost and weight, because a rubber damper is used instead of a mass damper, and it is possible to reduce vibrations and noises without increasing force for operating a shift lever and maximally prevent the function of reducing vibrations and noises from being deteriorated by frictional wear.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority to Korean Patent ApplicationNumber 10-2008-0123072 filed Dec. 5, 2008, the entire contents of whichapplication is incorporated herein for all purposes by this reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a damping system that is equipped on ashift cable to prevent vibrations and noises created by a transmissionfrom being transmitted into the interior of a vehicle through the shiftcable.

2. Description of Related Art

In general, since the driving force of vehicles considerably changes inaccordance with the amount of loads on the vehicle, conditions of roads,and the traveling velocity, etc., vehicles are equipped with atransmission for converting the power of the engine into appropriatedriving force.

The transmission can be largely classified into an automatictransmission and a manual transmission, and as shown in FIG. 1, atransmission 1 positioned in the engine compartment and a shift lever 2positioned in the interior of a vehicle are connected by a shift cable3.

Shift cable 3 is formed by coating a cover 3 b around an internal steelcore 3 a.

Further, shift cable 3 is equipped with a mass damper 4 for preventingvibrations and noises, which are created by transmission 1, from beingtransmitted to shift lever 2 through shift cable 3.

However, mass damper 4 of the related art is disadvantageous in terms ofthe cost and weight.

Further, since mass damper 4 is substantially attached to cover 3 bcoated around shift cable 3, it can reduce only the vibration and noisetransmitted through cover 3 b, but is insufficient to reduce thevibration and noise transmitted through steel core 3 a.

Further, cover 3 b of shift cable 3 and mass damper 4 are damaged byfriction when repeatedly used, such that as time progresses, the effectof reducing vibrations and noises decreases.

The information disclosed in this Background of the Invention section isonly for enhancement of understanding of the general background of theinvention and should not be taken as an acknowledgement or any form ofsuggestion that this information forms the prior art already known to aperson skilled in the art.

BRIEF SUMMARY OF THE INVENTION

Various aspects of the present invention are directed to provide adamping system for a shift cable that is advantageous in terms of thecost and weight because of not using a mass damper, has substantiallylarge effect of reducing vibrations and noises by reducing the vibrationand noises transmitted through a steel core of the shift cable, andmaximally prevent the function of reducing vibrations and noises frombeing deteriorated by frictional wear, even if it is repeatedly used fora long period of time.

In an aspect of the present invention, the damping system for a shiftcable, may include at least a socket housing that is fixed not to bemoved with the shift cable passing through both ends thereof when ashift lever is operated, and has a bottleneck section of which an innerdiameter gradually decreases, and a damper that is integrally combinedwith the shift cable passing through the damper, disposed in the sockethousing, and moved with the shift cable and selectively positioned inthe bottleneck section of the socket housing when the shift lever isoperated.

The bottleneck section is a section that connects a section having alarge inner diameter with a section having a small inner diameter in thesocket housing and of which the inner diameter gradually decreasestoward a shift lever housing.

The socket housing may be arranged such that the section having thelarge inner diameter receives the damper therein and faces atransmission housing, wherein one of the at least a socket housing isfixed to the transmission housing and another of the at least a sockethousing is fixed to the shift lever housing.

The shift lever is a shift lever for an automatic transmission having acommon traveling mode range including a P-stage, an R-stage, an N-stage,and a D-stage and a sports mode range including a + stage and a − stage,and the damper is inserted into the bottleneck section and positioned inthe bottleneck section, when the shift lever is positioned at theD-stage.

The damper may be made of rubber.

The damper may be a truncated cone having an equilateral trapezoid crosssection, wherein the damper is arranged such that an end having arelatively large diameter faces the transmission housing, wherein aplurality of damper projections integrally protrudes on the outercircumference of the damper, and wherein a plurality of grease groovesis formed on the outer circumference of the damper.

In another aspect of the present invention, the damping system for ashift cable, may include at least a socket housing that is fixed not tobe moved with the shift cable passing through both ends thereof when ashift lever is operated, and have a bottleneck section of which an innerdiameter gradually decreases, a damper that is disposed in the sockethousing to be moved slidably along the shift cable passing through bothends of the damper and selectively positioned in the bottleneck sectionof the socket housing while moving along the shift cable, a damper platethat is disposed in the socket housing and integrally combined with theshift cable at a predetermined distance from the damper, and an elasticmember disposed between the damper plate and the damper and connectingthe damper with the damper plate.

The shift lever is a shift lever for an automatic transmission having acommon traveling mode range including a P-stage, an R-stage, an N-stage,a D-stage, a third stage, a second stage, and an L-stage, and the damperis inserted into the bottleneck section and positioned in the bottlenecksection, when the shift lever is positioned at the D-stage, the thirdstage, the second stage, or the L-stage.

According to various aspects of the present invention, vibrations andnoises that are generated by a transmission and transmitted into theinterior of a vehicle through a shift cable are considerably reducedacross a damper that is positioned in a bottleneck section of a sockethousing and contacts with the bottleneck section, such that it ispossible to effectively exclude vibrations and noises transmitted intothe interior of a vehicle. Further, the present invention isadvantageous in terms of the cost and weight, because a rubber damper isused instead of a mass damper, and it is possible to reduce vibrationsand noises without increasing force for operating a shift lever andmaximally prevent the function of reducing vibrations and noises frombeing deteriorated by frictional wear.

The methods and apparatuses of the present invention have other featuresand advantages which will be apparent from or are set forth in moredetail in the accompanying drawings, which are incorporated herein, andthe following Detailed Description of the Invention, which togetherserve to explain certain principles of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view illustrating a configuration of the related art using amass damper to reduce vibrations and noises of a shift cable.

FIGS. 2 to 6 are views illustrating a damping system for a shift cableaccording to an exemplary embodiment of the present invention.

FIGS. 7 to 10 are views illustrating a damping system for a shift cableaccording to another exemplary embodiment of the present invention.

It should be understood that the appended drawings are not necessarilyto scale, presenting a somewhat simplified representation of variousfeatures illustrative of the basic principles of the invention. Thespecific design features of the present invention as disclosed herein,including, for example, specific dimensions, orientations, locations,and shapes will be determined in part by the particular intendedapplication and use environment.

In the figures, reference numbers refer to the same or equivalent partsof the present invention throughout the several figures of the drawing.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to various embodiments of thepresent invention(s), examples of which are illustrated in theaccompanying drawings and described below. While the invention(s) willbe described in conjunction with exemplary embodiments, it will beunderstood that present description is not intended to limit theinvention(s) to those exemplary embodiments. On the contrary, theinvention(s) is/are intended to cover not only the exemplaryembodiments, but also various alternatives, modifications, equivalentsand other embodiments, which may be included within the spirit and scopeof the invention as defined by the appended claims.

An exemplary embodiment according to the present invention, as shown inFIGS. 2 to 6, is configured such that an automatic transmission 1positioned in the engine compartment and a shift lever 2 positioned inthe interior of a vehicle are connected by a shift cable 3, a sockethousing 10 is fixed to a transmission housing 5 and a shift leverhousing 6, and shift cable 3 passes through both ends of socket housings10.

Shift lever 2 is a shift lever for an automatic transmission which canbe moved along a normal traveling mode range 21 including a P-stage(Parking), an R-stage (Reverse), an N-stage (Neutral), and a D-stage(Driving), and a sports mode range 22 including a + stage and a − stage,by operation of a driver.

Socket housing 10 has a section 11 having a large inner diameter, asection 12 having a small inner diameter, and a bottleneck section 13connecting sections 11, 12.

Bottleneck section 13 gradually decreases in inner diameter from section11 having a large inner diameter to section 12 having a small innerdiameter.

Socket housing 10 is arranged such that section having a relativelylarge inner diameter faces transmission housing 5 and section 12 havinga relatively small inner diameter at the opposite side faces shift leverhousing 6.

A rubber damper 30 is disposed in socket housing 10.

Damper 30 is integrally combined with shift cable 3 passing through bothends of damper 30, and moves with shift cable 3 and contacts withbottleneck section 13 of socket housing 10, when shift lever 2 isoperated.

That is, damper 30 moves along section 11 having a large inner diameterin socket housing 10 when shift lever 2 is moved to the P-stage,R-stage, and N-stage, and is positioned in contact with bottlenecksection 13 of socket housing 10 when shift lever 2 is positioned at theD-stage.

Damper 30 is formed in a cylinder shape having an equilateral trapezoidcross section and arranged such that the end having a relatively largediameter in both ends faces transmission housing 5 and the other endhaving a relatively small diameter at the opposite side faces shiftlever housing 6.

Meanwhile, a plurality of damper projections 31 is integrally formed onthe outer circumference of damper 30 and, if needed, a plurality ofconcave grease grooves 32 may be formed.

Damper projections 31 are formed to maximize the effect of reducingvibrations by increasing the contact force to bottleneck section 13 ofsocket housing 10, when damper 30 is positioned in bottleneck section13, and grease grooves 32 are formed to maximize the effect of reducingnoises by lubrication of grease 33 filled in grease grooves 32, whendamper 30 contacts with bottleneck section 13 of socket housing 10.

The operation of an exemplary embodiment of the present invention isdescribed hereafter.

When shift lever 2 is positioned at the P-stage, damper 30, as shown inFIG. 4, is moved and positioned to shift housing 5 in section 11 havinga large inner diameter of socket housing 10.

In this position, as shift lever 2 is moved from the R-stage to theN-stage by operation of a driver, damper 30 integrally combined withshift cable 3 is moved with shift cable 3 toward bottleneck section 13through section 11 having a large inner diameter of socket housing 10.

Further, when shift lever 2 is positioned at the D-stage, damper 30, asshown in FIG. 6, is inserted in bottleneck section 13 of socket housing10 and is in contact with bottleneck section 13 with damper projections31 therebetween.

When shift lever 2 is positioned at the D-stage and damper 30 ispositioned in bottleneck section 13 of socket housing 10 and is incontact with bottleneck section 13 as described above, the vibration andnoise created by transmission 1 and transmitted to the interior of avehicle through shift cable 3 are considerably reduced across sockethousing 10, and as a result, it is possible to effectively exclude thevibration and noise transmitted into the interior of a vehicle.

Further, grease 33 flows out of grease grooves 32 and lubricates thecontact surface between bottleneck section 13 and damper projections 31while damper 30 contacts to bottleneck section 13 of socket housing 10,such that it is possible to remove noise that is created when damper 30contacts to bottleneck section 13 of socket housing 10.

On the other hand, shift cable 3 is not pulled, when shift lever 2 ismoved from the D-stage to sports mode range 22, such that damper 30 iskept in contact with bottleneck section 12 of socket housing 10.

A damping system of another exemplary embodiment of the presentinvention is shown in FIGS. 7 to 10.

The configuration is the same as the exemplary embodiment describedabove with reference to FIG. 2 that an automatic transmission 1 and ashift lever 2 are connected by a shift cable 3, a socket housing 10 isfixed to a transmission housing 5 and a shift lever housing 6, and shiftcable 3 passes through both ends of socket housings 10.

Shift lever 2 of another exemplary embodiment of the present inventionis a shift lever for an automatic transmission which can be moved alonga normal traveling mode range 23 including a P-stage (Parking), anR-stage (Reverse), an N-stage (Neutral), a D-stage (Driving), a thirdstage, a second stage, and an L-stage by operation of a driver.

The configuration of socket housing 10 is the same as the exemplaryembodiment shown in FIG. 4 and detailed description is not provided.

A rubber damper 40 is disposed in socket housing 10.

That is, damper 40 is disposed to move along shift cable 3 passingthrough both ends of damper 40, such that when moving along shift cable3, damper 40 is inserted into a bottleneck section 13 of socket housing10 and selectively positioned in contact with bottleneck 13.

Damper 40 has the same configuration as damper 30 of the exemplaryembodiment described above with reference to FIG. 5, that is, it isformed in a cylinder shape having an equilateral trapezoid cross sectionand arranged such that one end having a relatively large diameter inboth ends faces transmission housing 5 and the other end having arelatively small diameter at the opposite side faces shift lever housing6.

On the outer circumference of damper 40, a plurality of damperprojections 41 is formed, and if needed, a plurality of concave greasegrooves 42 is formed and filled with grease 43.

Damper projections 41 are formed to maximize the effect of reducingvibrations by increasing the contact force to bottleneck section 13 ofsocket housing 10, when damper 40 is positioned in bottleneck section13, and grease grooves 42 are formed to maximize the effect of reducingnoises by lubrication of grease 43 filled in grease grooves 42, whendamper 40 contacts with bottleneck section 13 of socket housing 10.

Further, a damper plate 50 is integrally combined with shift cable 3 ata predetermined distance toward transmission housing 5 from damper 40.

Further, a compression spring 60 is disposed between damper 40 anddamper plate 50 and one end of compression spring 60 is connected todamper 40 and the other end is connected to damper plate 50.

In an exemplary embodiment of the present invention, the damper 40 maybe slidably coupled to the shift cable 3. For instance, the shift cable3 may slidably pass through the damper 40.

Therefore, when shift lever 2 is positioned at the D-stage, damper 40 isinserted in bottleneck section 13 of socket housing 10 and positioned incontact with bottleneck section 13.

The operation of another embodiment of the present invention isdescribed hereafter.

When shift lever 2 is positioned at the P-stage, damper 40, as shown inFIG. 8, is moved and positioned to shift housing 5 in section 11 havinga large inner diameter of socket housing 10.

In this position, as shift lever 2 is moved from the R-stage to theN-stage by operation of a driver, damper plate 50 integrally combinedwith shift cable 3 and damper 40 connected with damper plate 50 bycompression spring 60 are moved with shift cable 3 toward bottlenecksection 13 through section 11 having a large inner diameter of sockethousing 10.

Further, when shift lever 2 is positioned at the D-stage, damper 40, asshown in FIG. 10, is inserted in bottleneck section 13 of socket housing10 and is in contact with bottleneck section 13 with damper projections41 therebetween.

When shift lever 2 is positioned at the D-stage and damper 40 is incontact with bottleneck section 13 of socket housing 10 as describedabove, the vibration and noise created by transmission 1 and transmittedto the interior of a vehicle through shift cable 3 are considerablyreduced across socket housing 10, and as a result, it is possible toeffectively exclude the vibration and noise transmitted into theinterior of a vehicle.

Further, grease 43 flows out of grease grooves 42 and lubricates thecontact surface between bottleneck section 13 and damper projections 41while damper 40 contacts to bottleneck section 13 of socket housing 10,such that it is possible to remove noise that is created when damper 40contacts to bottleneck section 13 of socket housing 10.

When shift lever 2 is moved from the D-stage to the third stage, secondstage, and L-stage, damper 40 is no longer moved toward shift leverhousing 6 by bottleneck section 13 of socket housing 10, but shift cable3 keeps moving.

That is, since shift cable 3 passes through damper 40 and damper 40 canmove along shift cable 3, shift cable 3 can keep moving, although damper40 cannot be moved toward shift lever housing 6, when shift lever 2 ismoved from the D-stage to the third stage, second stage, and L-stage.

As shift lever 2 is moved from the D-stage to the third stage, secondstage, and L-stage and shift cable 3 correspondingly keeps moving asdescribed above, compression spring 60 starts to deform as shown in FIG.10 an damper 40 is compressed by larger force in bottleneck 13 of sockethousing 10, such that the effect of reducing the vibration and noiseacross damper 40 is further improved.

In the exemplary embodiments of the present invention, as describedabove, since a rubber damper is used instead of a mass damper, thisconfiguration is advantageous in terms of the cost and weight and canreduce vibrations and noises without increasing force for operatingshift lever 2. Further, it is possible to maximally prevent the functionof reducing vibrations and noises from being deteriorated by frictionalwear.

For convenience in explanation and accurate definition in the appendedclaims, the terms “interior”, “inner” and “outer” are used to describefeatures of the exemplary embodiments with reference to the positions ofsuch features as displayed in the figures.

The foregoing descriptions of specific exemplary embodiments of thepresent invention have been presented for purposes of illustration anddescription. They are not intended to be exhaustive or to limit theinvention to the precise forms disclosed, and obviously manymodifications and variations are possible in light of the aboveteachings. The exemplary embodiments were chosen and described in orderto explain certain principles of the invention and their practicalapplication, to thereby enable others skilled in the art to make andutilize various exemplary embodiments of the present invention, as wellas various alternatives and modifications thereof. It is intended thatthe scope of the invention be defined by the Claims appended hereto andtheir equivalents.

1. A damping system comprising: a shift cable; at least a socket housingthat is fixed not to be moved with the shift cable passing through bothends thereof when a shift lever is operated, and has a bottlenecksection of which an inner diameter gradually decreases; and a damperthat is integrally combined with the shift cable passing through thedamper, disposed in the socket housing, and moved with the shift cableand selectively positioned in the bottleneck section of the sockethousing when the shift lever is operated, wherein the shift lever is ashift lever for an automatic transmission having a common traveling moderange including a P-stage, an R-stage, an N-stage, and a D-stage and asports mode range including a +stage and a −stage, wherein the damper isinserted into the bottleneck section and positioned in the bottlenecksection, when the shift lever is positioned at the D-stage, wherein thedamper is made of rubber, wherein the damper is a truncated cone havingan equilateral trapezoid cross section, and wherein a plurality ofdamper projections integrally protrudes on an outer circumference of thedamper.
 2. The damping system as defined in claim 1, wherein thebottleneck section is a section that connects a section having a largeinner diameter with a section having a small inner diameter in thesocket housing and of which the inner diameter gradually decreasestoward a shift lever housing.
 3. The damping system as defined in claim2, wherein the socket housing is arranged such that the section havingthe large inner diameter receives the damper therein and faces atransmission housing.
 4. The damping system as defined in claim 3,wherein one of the at least a socket housing is fixed to thetransmission housing and another of the at least a socket housing isfixed to the shift lever housing.
 5. The damping system as defined inclaim 1, wherein the damper is arranged such that an end having arelatively large diameter faces the transmission housing.
 6. The dampingsystem as defined in claim 1, wherein a plurality of grease grooves isformed on the outer circumference of the damper.